Model View - Delegate - setIndexWidget

[starcontrol]

Hi,
I tried to use the setIndexWidget() function in my MV GUI Qt Code.
I just want to have a simple composed widget in my subclass instance of QTableView, an widget inside an table cell.
Do you have any ideas or better code examples, how to use this function in the right way ? Trolltechs API docu does not explain, how to use this function in Qt's Model-View architecture. As is read before, the best way would be to use this in the delagate (with some dirty tricks), here you find some threads too, which describe my problem best:

http://lists.trolltech.com/qt-intere...ad00097-0.html

http://lists.trolltech.com/qt-intere...ad00550-0.html

Kind regards,
Alex

[jpn]

Index widgets are not actually part of the MVC concept but they are additional widgets laid on top of items in the view. They are expensive to maintain and one should avoid them. What kind of widgets would you like to put there?

[starcontrol]

I want to provide widgets in table cells, which consist of some text labels, some icons and an text edit field(date field), perhaps similar to the graphical interface of outlook calender...
Can you help me how to proceed ?

[wysota]

As for icons and text the default delegate should handle it fine. As for text edit fields - you'll be only editing one field at a time, so a slightly modified delegate returning a QTextEdit instance as the editor should be enough.

[starcontrol]

Do you mean, I have to use the different roles in my custom model to let the default delegate render the cells content ?
I tried to do so, but what made me first think of to try an different way, was, that with the decoration role I only could render one icon.
I am also not sure, would it be possible to have drag and drop support, if I implement the cells content in this way ?

[wysota]

Do you mean, I have to use the different roles in my custom model to let the default delegate render the cells content ?

Yes, that's correct.

I tried to do so, but what made me first think of to try an different way, was, that with the decoration role I only could render one icon.

If you want something non-standard, use a custom delegate. You'll be able to render whatever you want depending on the data contained in an item.

I am also not sure, would it be possible to have drag and drop support, if I implement the cells content in this way ?

Yes, itemviews support d&d.

[starcontrol]

So I have to implement the delegates paint() function to render my widget ?
Do I have to paint my icons, text labels, editor fields ? There must be an way, instead "manually painting" the widgets, or ?

A second wish:
I have to create spans inside my table view, these spans will have to contain what I described before. The QTableView has an method setSpan(), but how can I check in my custom view from my custom model, where it has to paint the spans?

[wysota]

So I have to implement the delegates paint() function to render my widget ?

Not widget, but item - yes.

Do I have to paint my icons, text labels, editor fields ?

You only paint the inactive state. In the editing state the delegate returns a real widget.

There must be an way, instead "manually painting" the widgets, or ?

I think you have to define what you mean by "widget". Icon is not a widget. Text is not a widget. So, what is a widget according to your definition?

I have to create spans inside my table view, these spans will have to contain what I described before. The QTableView has an method setSpan(), but how can I check in my custom view from my custom model, where it has to paint the spans?

Why should the model care about the span? It's just a set of data.

[starcontrol]

I think "manually painting" the items may not be the succeeding way. If I'll use the delegates paint method, I have a simple bitmap, which is rendered inside the table view cell (in my case, inside the span). If the span will be very long, because of an longer event (calender event) the bitmap will be strechted and the text will be rendered not clean, you understand what I mean ?
The second problem is, the item will also have to contain an "active text edit field (date edit field for editing the event)" in the inactive state, how will this be possible with an rendered bitmap ?

Kind regards,
Alex

[wysota]

If the span will be very long, because of an longer event (calender event) the bitmap will be strechted and the text will be rendered not clean, you understand what I mean ?

The model doesn't care. It doesn't have a concept of width or height. The delegate handles all that and it is given the rectangle that needs to be painted.

The second problem is, the item will also have to contain an "active text edit field (date edit field for editing the event)" in the inactive state, how will this be possible with an rendered bitmap ?

Render the date as text and react on clicking the cell - activate the editor and let the user edit the date. You don't need the spinbox to be active all the time. You can even render the looks of the box if you really need to.

[starcontrol]

Ok, I tried your suggestion..., but nothing is displayed in my table cells, do you know, what I am doing wrong ? How do I have to implement the sizeHint() function ?

void SchulungsplanDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex &index)
{	
	painter->save();
 
	if (option.state & QStyle::State_Active)
		painter->fillRect(option.rect, option.palette.highlight());
 
	// gets the cells size and draws the text inside
	QRect myRect = QRect(option.rect.topLeft(), option.rect.bottomRight()) ;
	painter->drawText(myRect, Qt::AlignCenter, "test");
 
	painter->restore();
}
 
/*
QSize sizeHint(const QStyleOptionViewItem &option,
                          const QModelIndex &index ) const
{
	// ????????????
}

void SchulungsplanDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex &index)
{	
	painter->save();
	
	if (option.state & QStyle::State_Active)
		painter->fillRect(option.rect, option.palette.highlight());
	
	// gets the cells size and draws the text inside
	QRect myRect = QRect(option.rect.topLeft(), option.rect.bottomRight()) ;
	painter->drawText(myRect, Qt::AlignCenter, "test");
	
	painter->restore();
}

/*
QSize sizeHint(const QStyleOptionViewItem &option,
                          const QModelIndex &index ) const
{
	// ????????????
}

To copy to clipboard, switch view to plain text mode